Brush-holder for dynamo-electric machines or motors



(Ho Model.)

C. O. C. BILLBERG.

BRUSH HOLDER FOR DYNAMO ELECTRIC MACHINES 0R MOTORS.

No. 465,234. Patented Dec. 15, 1891..

dwmamwer 6; lftormqys UNITED STATES PATENT OFFICE.

CARL O. C. BILLBERG, OF PHILADELPHIA, PENNSYLVANIA.

BRUSH-HOLDER FOR DYNAMO-ELECTRIC MACHINES OR MOTORS.

SPECIFICATION forming part of Letters Patent No. 465,284, dated December 15, 1891.

Application filed April 25, 1891. Serial No. 390,371. (No model.)

To all w/tom, it may concern:

Be it known that I, CARL O. O. BILLBERG, a subject of the King of Sweden, and a resident of Philadelphia, Pennsylvania, have invented certain Improvementsv in Dynamo-Electric Machines orElectric Motors, of which the following is a specification.

My invention relates to that class of brushholders which are mounted upon the frame of a dynamo-electric machine or electric motor and when once fixed in position remain so, in contradistinction to that class of brush-hold ers in which the brushes are carried by an arm swinging on the axis of the commutor.

The objects of my invention are to so construct such a brush-holder and its mounting that the proper bearing of the brush upon the commutator and the proper relation of the brush thereto will at all times be insured. These objects I attain in the manner hereinafter set forth, reference being had to the accompanying drawings, in which Figure 1 is a view, mainly in elevation, but partly in section, of a dynamo-electric ma chine or electric motor provided with my improved holder for the commutator-brushes. Fig. 2 is an enlarged sectional view, partly in elevation, of one of said brush-holders with its brushes; and Fig. 3 is a plan view of the same with the outline of the brushes shown by dotted lines.

In Fig. 1, A A represent the field-magnets; A, the pole-pieces; B, the armature; D, the commutator, and a the commutator-brushes of a dynamo-electric machine or electric motor, which may be of any of the usual types. Each of the brushes a is by preference made in two parts, as shown by dotted lines in Fig. 3, and each part of the brush is mounted in a slide b, the brush being clamped in said slide by means of a follower d, acted on by a set-screw f, which passes through a threaded opening in a yoke g on the slide and is locked in position after adjustment by means of a locknut f. The slide 1) has on the under side a lug b, which is pinned or otherwise secured to a rod 72, the latter being guided so as to be free to slide in bearings 2' on a frame 7;,which has a split clamp k, embracing the bent upper end of a supporting-bolt m, the clamp besaid rod and the lug b on the slide 1) is a spring 20, which tends to project the slide and the brush carried thereby, so as to maintain said brush at all times in close contact with the periphery of the commutator D, while the vertical adjustment of the supporting-bolt m and the pivotal adjustment of the frame it on the bent upper end of said bolt permit of the proper adjustment of the holder to effect the desired angular bearing of the brush upon the commutator.

By causing the spring 10 to act upon a slide carrying the commutator-brush and havinga guide-rod adapted at each end to a bearing in the frame 7.; the movement of said brush is facilitated, as the slide can be conveniently guided by the rod 7L. Hence a light spring can be used and there is much less liability of the brush to stick than if the spring acted directly upon the material of which the brush is composed.

The yokes g of the two slides Z1 have engaging-lugs w, as shown in Fig. 3, so that when it is desired to remove the brushes from contact with the commutator the pulling back of the right-hand slide will effect a like rearward movement of the left-hand slide.

Having thus described my invention, I claim and desire to secure by Letters Patcnt 1. The combination of the commutatorbrush of a dynamo-electric machine or electric motor, a slide on which said brush is clamped, a rod secured to said slide, a frame having bearings for each end of said rod, and a spring acting on said slide and tending to project the same, substantially as specified.

2. The combination of the com mutatorbrush, the slide carrying the same, the spring acting on said slide, the frame carrying the slide is imparted to the other, substantially slide and having a clamp, a supporting-bolt as specified.

having a bent portion adapted to said clamp, In testimony whereof I have signed my and means for Vertically adjusting said bolt, name to this specification in the presence of 5 substantially as specified. two subscribing witnesses.

3. The combination of a two-part oommu- 4 tor-brush, a slide for each part of the same, a CARL BILLLERG' carrier for said slides,'springs acting on the Witnesses: slides, and lugs on the slides engaging each EUGENE ELTERICH,

10 other, whereby rearward movement of one HARRY SMITH. 

